Porsche 917k – Vic Elford & Gérard Larrousse – 12h of Sebring 1971. Limited edition

Porsche 917k

Porsche 917k – Vic Elford & Gérard Larrousse – 12h of Sebring 1971. Limited edition

The Porsche 917 is a sports prototype race car developed by German manufacturer Porsche to exploit the regulations regarding the construction of 5-litre sports cars.

Powered by a Type 912 flat-12 engine which was progressively enlarged from 4.5 to 5.0 litres, the 917 was introduced in 1969 and initially proved unwieldy on the race track but continuous development improved the handling and it went on to dominate sports-car racing in 1970 and 1971.

In 1970 it gave Porsche its first overall win at the 24 Hours of Le Mans, a feat it would repeat in 1971. It would be chiefly responsible for Porsche winning the International Championship for Makes in 1970 and 1971.

Porsche went on to develop the 917 for Can-Am racing, culminating in the twin-turbocharged 917/30 which was even more dominant in the role. Porsche drivers would win the Can-Am championship in 1972 and 1973. 917 drivers also won the Interserie championship every year from 1969 to 1975.

The 917K was an evolution of the original 1969 car. After the first 917s were run in 1969, it was clear the car’s aerodynamics made it nearly undriveable at higher speeds. After the 1969 championship season had finished, John Wyer requested a 3-day test session at the Austrian Österreichring course.

The Porsche technical team turned out ready to do some serious panel work on the coupé and in order to make a comparison, brought along the Can-Am 917PA Spyder. The drivers present instantly preferred the PA and together, the JW Automotive and Porsche engineers came up with the idea of a more upswept tail (as on the 917PA). The JW team had had similar high speed handling problems with the early Ford GT40 models.

With gaffer tape and aluminium sheet, a completely new short tail was evolved at the racetrack. This was quickly converted into a ‘production’ design back at Porsche and the 917K (Kurzheck) made its public debut at the season opening 1970 24 Hours of Daytona.

Such was the improvement in the stability of the car at high speed, the 917K became the standard configuration for all races except Le Mans, the Nürburgring 1000 km and the Targa Florio. This car was raced at every event by JW Automotive and Porsche Salzburg in the 1970 season except the Targa Florio and the Nürburgring 1000 km.

The smaller, more nimble and generally better suited 908/03s were used for those races, but privateers used the 917K at the Nürburgring 1000 km, and Vic Elford drove a lap of the 44-mile Targa Florio course in the 917K at Ferdinand Piëch’s request.

The 917K won 7 out of 10 races; all the races it competed in. Later on in the 1970 season, the 4.5 litre flat-12 was bored out to 4.9 litres, then 5 litres.

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History : See wikipedia article